Effects of symmetrical and asymmetrical bumps on plasmonic behavior in a metallic grating |
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| Authors: | Zhimin Liu Hui Yang Xiao Peng Haiqing Xu Guangtao Cao |
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| Affiliation: | 1. College of Physics Science and Technology, Central South University , Changsha 410083 , P.R. China;2. College of Basic Sciences, East China Jiaotong University , Nanchang 330013 , P.R. China;3. College of Physics Science and Technology, Central South University , Changsha 410083 , P.R. China;4. College of Materials Science and Engineering, Central South University , Changsha 410083 , P.R. China |
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| Abstract: | The influence was investigated of symmetrical and asymmetrical bumps on plasmonic behavior in a metallic grating. Compared with the resonant peaks of a smooth-slit grating, the peaks of odd (even) modes exhibit a blue-shift (red-shift) and the transmission properties are tunable by the size of bumps when the bumps are laid symmetrically. However, the peaks of all modes only exhibit a red-shift when the grating is engraved with a bump and a cut in the same slit (namely bend slit), and the bend slit can achieve the properties of a straight slit. Additionally, it is found that the dips in transmission spectrum can be adjusted by altering the size of the bumps if the bumps are set asymmetrically. Fabry–Pérot-like resonance, field interference and phase resonance mechanisms have been suggested for the physical origins of these observations. |
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| Keywords: | metallic grating transmission Fabry–Pérot-like resonance phase resonance |
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